They fix their games. However here's how the patching process normally goes unless they push a single patch.
Since there are 3 versions. Bugs are done and hammered out, local testing done. Patch sits done for the PC. Then the same patch is tested and modified for both console versions. Then both of those patches are sent to QA at Sony and MS for testing. This can take a literal age and a half.
So while the PC version is done and sitting around, you get to sit around with your thumb up your butt because you're waiting for MS and Sony to do their testing. If you want to place any blame on slow patching, it lies directly at slow QA due to consoles.